在我以前的印象里，页面的字体属性，背景，等样式在页面加载后基本上都是固定的了，但是今天看到可以通过js修改页面的样式，觉得有必要和大家分享下。
test.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=GB18030"><title>css ajax </title><script type ="text/javascript" src ="test.js"> </script><link href ="styles.css" type ="text/css" rel ="stylesheet"/></head><body ><table id ="table" ><tr><th id ="tableHead">Product Name</th></tr><tr><td id ="tableFirstLine">AirPlane</td></tr><tr><td id ="tableSecondLine">Big car</td></tr></table><br/><input type ="button" value ="set style 1" onclick ="setStyle1()"/>触发事件改变页面的样式<input type ="button" value ="set style 2" onclick ="setStyle2()"/>触发事件改变页面样式</body></html>
现在页面的文字样式，背景，字体大小，都是系统默认的，待会儿，给大家演示下运行结果，可以比较下哦
test.js
function setStyle1(){ //将表的风格改为style1 //获取html的引用 oTable = document.getElementById("table"); oTableHead = document.getElementById("tableHead"); oTableFirstLine =document.getElementById("tableFirstLine"); otableSecondLine = document.getElementById("tableSecondLine"); //设置风格 oTable.className ="Table1"; oTableHead.className ="TableHead1"; oTableFirstLine.className ="TableContent1"; oTableSecondLine.classNamee ="TableContent1";}function setStyle2(){ //将表格的风格改为style2 //获取html元素的引用 oTable = document.getElementById("table"); oTableHead = document.getElementById("tableHead"); oTableFirstLine =document.getElementById("tableFirstLine"); otableSecondLine = document.getElementById("tableSecondLine"); //设置风格 oTable.className ="Table2"; oTableHead.className ="TableHead2"; oTableFirstLine.className ="TableContent2"; oTableSecondLine.classNamee ="TableContent2";}styles.css
/* @CHARSET "GB18030"; */.Table1{ border:DarkGreen 1px solid; background-color:LightGreen; }.TableHead1{ font-family:Verdana,Arial; font-weight:bold; font-size:10pt; }.TableContent1{ font-family:Verdana,Arial; font-size:10pt; }.Table2{ border:DarkBlue 1px solid; background-color:LightBlue; }.TableHead2{ font-family:Verdana,Arial; font-weight:bold; font-size:10pt; }.TableContent2{ font-family:Verdana,Arial; font-size:10pt; }运行效果如下：
另外这些知识点可以用在UIWebView与js的交互上哦，下面给大家演示下运行及效果哦
iOS的demo地址：demo
